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Build: Document SO_AGE and TURBOJPEG_SO_AGE vars

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DRC
2022-11-03 11:22:50 -05:00
parent 8917c54877
commit 8c5e78ce29
1 changed files with 22 additions and 1 deletions
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23
CMakeLists.txt
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@@ -287,6 +287,16 @@ if(NOT WITH_JPEG8)
report_option(WITH_MEM_SRCDST "In-memory source/destination managers") report_option(WITH_MEM_SRCDST "In-memory source/destination managers")
endif() endif()
# 0: Original libjpeg v6b/v7/v8 API/ABI
#
# libjpeg v6b/v7 API/ABI emulation:
# 1: + In-memory source/destination managers (libjpeg-turbo 1.3.x)
# 2: + Partial image decompression functions (libjpeg-turbo 1.5.x)
# 3: + ICC functions (libjpeg-turbo 2.0.x)
#
# libjpeg v8 API/ABI emulation:
# 1: + Partial image decompression functions (libjpeg-turbo 1.5.x)
# 2: + ICC functions (libjpeg-turbo 2.0.x)
set(SO_AGE 2) set(SO_AGE 2)
if(WITH_MEM_SRCDST) if(WITH_MEM_SRCDST)
set(SO_AGE 3) set(SO_AGE 3)
@@ -337,8 +347,19 @@ message(STATUS "libjpeg API shared library version = ${SO_MAJOR_VERSION}.${SO_AG
# names of functions whenever they are modified in a backward-incompatible # names of functions whenever they are modified in a backward-incompatible
# manner, it is always backward-ABI-compatible with itself, so the major and # manner, it is always backward-ABI-compatible with itself, so the major and
# minor SO versions don't change. However, we increase the middle number (the # minor SO versions don't change. However, we increase the middle number (the
# SO "age") whenever functions are added to the API. # SO "age") whenever functions are added to the API, because adding functions
# affects forward API/ABI compatibility.
set(TURBOJPEG_SO_MAJOR_VERSION 0) set(TURBOJPEG_SO_MAJOR_VERSION 0)
# 0: TurboJPEG 1.3.x API
# 1: TurboJPEG 1.4.x API
# The TurboJPEG 1.5.x API modified some of the function prototypes, adding
# the const keyword in front of pointers to unmodified buffers, but that did
# not affect forward API/ABI compatibility.
# 2: TurboJPEG 2.0.x API
# The TurboJPEG 2.1.x API modified the behavior of the tjDecompressHeader3()
# function so that it accepts "abbreviated table specification" (AKA
# "tables-only") datastreams as well as JPEG images, but that did not affect
# forward API/ABI compatibility.
set(TURBOJPEG_SO_AGE 2) set(TURBOJPEG_SO_AGE 2)
set(TURBOJPEG_SO_VERSION 0.${TURBOJPEG_SO_AGE}.0) set(TURBOJPEG_SO_VERSION 0.${TURBOJPEG_SO_AGE}.0)